(dot/state) Implement telemetry for apply scheduled and forced changes

[EclesioMeloJunior]

Issue summary

Gossamer should implement the telemetry metrics for scheduled changes and forced changes as the substrate does

• Scheduled (standard) changes -> https://github.com/paritytech/substrate/blob/50de15d8740a129db9c18a6698fbd183b00326a2/client/consensus/grandpa/src/authorities.rs#L582

• Forced changes -> https://github.com/paritytech/substrate/blob/50de15d8740a129db9c18a6698fbd183b00326a2/client/consensus/grandpa/src/authorities.rs#L501

Other information and links

• More specifically the metrics should be implemented at dot/state/grandpa.go at function ApplyScheduledChanges, ApplyForcedChanges respectivelly

[github-actions]

🎉 This issue has been resolved in version 0.8.0 🎉

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